10g新特性之-expdp与传统exp的速度比较

　　 
　　测试环境:
　　
　　System Configuration: Sun Microsystems sun4u Sun Enterprise 450 (4 X UltraSPARC-II 296MHz)
　　System clock frequency: 99 MHz
　　Memory size: 2048 Megabytes
　　
　　数据量:
　　

　　单表测试,1363292行记录，116.6 MB左右数据
　　
　　1.使用并行 expdp
　　
　　花费时间:
　　Tue Apr 27 10:21:54 CST 2004 - Tue Apr 27 10:21:10 CST 2004 = 43秒
　　
　　$ cat bak.sh
　　date
　　expdp eygle/eygle dumpfile=big_big_table.dmp directory=dpdata tables=big_big_table job_name=exptab parallel=4
　　date
　　$ ./bak.sh
　　Tue Apr 27 10:21:10 CST 2004
　　
　　Export: Release 10.1.0.2.0 - 64bit Production on Tuesday, 27 April, 2004 10:21
　　
　　Copyright (c) 2003, Oracle. All rights reserved.
　　
　　Connected to: Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - 64bit Production
　　With the Partitioning, OLAP and Data Mining options
　　Starting "EYGLE"."EXPTAB": eygle/******** dumpfile=big_big_table.dmp directory=dpdata tables=big_big_table job_name=exptab parallel=4
　　Estimate in progress using BLOCKS method...
　　Processing object type TABLE_EXPORT/TABLE/TBL_TABLE_DATA/TABLE/TABLE_DATA
　　Total estimation using BLOCKS method: 248 MB
　　Processing object type TABLE_EXPORT/TABLE/TABLE
　　. . exported "EYGLE"."BIG_BIG_TABLE" 116.6 MB 1363292 rows
　　Master table "EYGLE"."EXPTAB" suclearcase/" target="_blank" >ccessfully loaded/unloaded
　　******************************************************************************
　　Dump file set for EYGLE.EXPTAB is:
　　/opt/oracle/dpdata/big_big_table.dmp
　　Job "EYGLE"."EXPTAB" successfully completed at 10:21
　　
　　Tue Apr 27 10:21:54 CST 2004
　　
　　2.使用正常 expdp
　　
　　花费时间:
　　Tue Apr 27 10:23:36 CST 2004 - Tue Apr 27 10:23:02 CST 2004 = 34 秒
　　
　　看来并行的差异需要更大的数据量的测试
　　
　　$ cat bak2.sh
　　date
　　expdp eygle/eygle dumpfile=big_big_table2.dmp directory=dpdata tables=big_big_table job_name=exptab
　　date
　　
　　$ ./bak2.sh
　　Tue Apr 27 10:23:02 CST 2004
　　
　　Export: Release 10.1.0.2.0 - 64bit Production on Tuesday, 27 April, 2004 10:23
　　
　　Copyright (c) 2003, Oracle. All rights reserved.
　　
　　Connected to: Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - 64bit Production
　　With the Partitioning, OLAP and Data Mining options
　　Starting "EYGLE"."EXPTAB": eygle/******** dumpfile=big_big_table2.dmp directory=dpdata tables=big_big_table job_name=exptab
　　Estimate in progress using BLOCKS method...
　　Processing object type TABLE_EXPORT/TABLE/TBL_TABLE_DATA/TABLE/TABLE_DATA
　　Total estimation using BLOCKS method: 248 MB
　　Processing object type TABLE_EXPORT/TABLE/TABLE
　　. . exported "EYGLE"."BIG_BIG_TABLE" 116.6 MB 1363292 rows
　　Master table "EYGLE"."EXPTAB" successfully loaded/unloaded
　　******************************************************************************
　　Dump file set for EYGLE.EXPTAB is:
　　/opt/oracle/dpdata/big_big_table2.dmp
　　Job "EYGLE"."EXPTAB" successfully completed at 10:23
　　
　　Tue Apr 27 10:23:36 CST 2004
　　
　　3.常规路径exp
　　
　　花费时间:Tue Apr 27 10:27:00 CST 2004 - Tue Apr 27 10:24:54 CST 2004 = 2:06
　　
　　这是花费时间最长的.
　　是 126/34 = 370.58823529411764705882352941176%
　　
　　expdp明显快于exp
　　
　　$ cat bak3.sh
　　date
　　exp eygle/eygle file=big_big_table3.dmp tables=big_big_table
　　date
　　
　　$ ./bak3.sh
　　Tue Apr 27 10:24:54 CST 2004
　　
　　Export: Release 10.1.0.2.0 - Production on Tue Apr 27 10:24:54 2004
　　
　　Copyright (c) 1982, 2004, Oracle. All rights reserved.
　　
　　Connected to: Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - 64bit Production
　　With the Partitioning, OLAP and Data Mining options
　　Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set
　　
　　About to export specified tables via Conventional Path ...
　　. . exporting table BIG_BIG_TABLE 1363292 rows exported
　　Export terminated successfully without warnings.
　　Tue Apr 27 10:27:00 CST 2004
　　
　　4.直接路径exp
　　
　　花费时间:
　　Tue Apr 27 10:52:09 CST 2004 - Tue Apr 27 10:50:58 CST 2004 = 1.11
　　是 71/34 = 208.82352941176470588235294117647%
　　
　　直接路径导出快于常规路径导出，但是仍然不敌expdp
　　
　　$ cat bak4.sh
　　date
　　exp eygle/eygle file=big_big_table3.dmp tables=big_big_table direct=y
　　date
　　
　　$ ./bak4.sh
　　Tue Apr 27 10:50:58 CST 2004
　　
　　Export: Release 10.1.0.2.0 - Production on Tue Apr 27 10:50:58 2004
　　
　　Copyright (c) 1982, 2004, Oracle. All rights reserved.
　　
　　Connected to: Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - 64bit Production
　　With the Partitioning, OLAP and Data Mining options
　　Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set
　　
　　About to export specified tables via Direct Path ...
　　. . exporting table BIG_BIG_TABLE 1363292 rows exported
　　Export terminated successfully without warnings.
　　Tue Apr 27 10:52:09 CST 2004
　　
　　5.文件大小
　　
　　传统方式exp文件要大于expdp的文件大小
　　
　　大约大出10M左右.
　　
　　$ ls -al
　　total 741566
　　drwxr-xr-x 2 oracle dba 512 Apr 27 10:50 .
　　drwxr-xr-x 23 oracle dba 1024 Apr 26 22:53 ..
　　-rwxr-xr-x 1 oracle dba 120 Apr 27 10:21 bak.sh
　　-rwxr-xr-x 1 oracle dba 111 Apr 27 10:22 bak2.sh
　　-rwxr-xr-x 1 oracle dba 71 Apr 27 10:24 bak3.sh
　　-rwxr-xr-x 1 oracle dba 80 Apr 27 10:50 bak4.sh
　　-rw-r----- 1 oracle dba 122413056 Apr 27 10:21 big_big_table.dmp
　　-rw-r----- 1 oracle dba 122417152 Apr 27 10:23 big_big_table2.dmp
　　-rw-r--r-- 1 oracle dba 134604800 Apr 27 10:52 big_big_table3.dmp
　　-rw-r--r-- 1 oracle dba 965 Apr 27 10:23 export.log
　　
　　以下是导入测试:
　　
　　6. imp测试
　　
　　花费时间: Tue Apr 27 11:15:11 CST 2004 - Tue Apr 27 11:08:24 CST 2004 = 6:47s
　　
　　$ cat rev2.sh
　　date
　　imp eygle/eygle file=big_big_table3.dmp tables=big_big_table
　　date
　　
　　$ ./rev2.sh
　　Tue Apr 27 11:08:24 CST 2004
　　
　　Import: Release 10.1.0.2.0 - Production on Tue Apr 27 11:08:24 2004
　　
　　Copyright (c) 1982, 2004, Oracle. All rights reserved.
　　
　　Connected to: Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - 64bit Production
　　With the Partitioning, OLAP and Data Mining options
　　
　　Export file created by EXPORT:V10.01.00 via direct path
　　import done in ZHS16GBK character set and AL16UTF16 NCHAR character set
　　. importing EYGLE's objects into EYGLE
　　. . importing table "BIG_BIG_TABLE" 1363292 rows imported
　　Import terminated successfully without warnings.
　　Tue Apr 27 11:15:11 CST 2004
　　$
　　
　　7. impdp
　　
　　花费时间: Tue Apr 27 11:07:06 CST 2004 - Tue Apr 27 11:06:40 CST 2004 = 26s
　　
　　与imp相比这个速度实在是惊人.
　　407/26 = 1565.3846153846153846153846153846%
　　
　　无怪乎Oracle说impdp才是data pump真正杰出的地方(really stands out)
　　
　　$ ./rev.sh
　　Tue Apr 27 11:06:40 CST 2004
　　
　　Import: Release 10.1.0.2.0 - 64bit Production on Tuesday, 27 April, 2004 11:06
　　
　　Copyright (c) 2003, Oracle. All rights reserved.
　　
　　Connected to: Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - 64bit Production
　　With the Partitioning, OLAP and Data Mining options
　　Master table "EYGLE"."IMPTAB" successfully loaded/unloaded
　　Starting "EYGLE"."IMPTAB": eygle/******** dumpfile=big_big_table.dmp tables=big_big_table directory=dpdata job_name=imptab
　　Processing object type TABLE_EXPORT/TABLE/TABLE
　　Processing object type TABLE_EXPORT/TABLE/TBL_TABLE_DATA/TABLE/TABLE_DATA
　　. . imported "EYGLE"."BIG_BIG_TABLE" 116.6 MB 1363292 rows
　　Job "EYGLE"."IMPTAB" successfully completed at 11:07
　　
　　Tue Apr 27 11:07:06 CST 2004

原文转自：http://www.ltesting.net